but saw hernandez was still moving so he doubled back and shot him again, killing him. at the top of the escalator, ciancia arrived at the t.s.a. checkpoint and entered the area behind security by taking the exit lane reserved for deplaning passengers. he then headed straight down the concourse. sources say he appeared to be hunting t.s.a. officers as he fired away. witness statements and a review of airport security video also indicates to investigators that t.s.a. employees were the gunman's only intended targets. police believe other passengers who were wounded either by gunfire or trying to escape were struck by rounds that ciancia fired at the t.s.a. officered but missed. >> pelley: john, some police departments put armed officers at the checkpoints. the t.s.a. officers aren't armed. why were there no armed l.a.p.d. officer there is? >> well, the airport has its own police department, the los angeles world airports police and for a number of years the practice was to have an armed officer and a partner behind every checkpoint. a year ago they started looking at cha